hmmmmm i read threw your thread, and from what your saying,im thinking of one
problem?!?!!
cant remember if you had the fault codes read?
on your intake (shiny red one) there is a hose that comes up from the back of the acuator to the sideof the airintake hose,check it!!!!!!!!!!!!!!!!!!
mine split ,meaning there was to much hot air around the engine bay.. leading to limp home mode!
only thing i had was. it was ok when i converted back to standard,due to the fact the angle had moved very slightly ,but the split was still there and needed to be cut out and repaired.
so have a look and let me know what you find.......